Tightening Torque - Bosch PS42 Instrucciones De Funcionamiento Y Seguridad

BATTERy CHARGE STATUS INDI-
CATOR LIGHTS
Your tool is equipped with charge status indi-
cator lights (Fig. 1). The indicator lights shows
the charge status of the battery for a few sec-
onds when the On/Off trigger is pressed half-
way or fully.
LED
Continuous lighting 3 x green
Continuous lighting 2 x green
Continuous lighting 1 x green
Flashing light 1 x green
INSERTING AND RELEASING
BATTERy PACK
Release battery pack from tool by pressing on
both sides of the battery release tabs and pull
downward (Fig. 6).
To insert battery, align battery and slide bat-
tery pack into tool until it locks into position.
Do not force.
damaged, do not insert into tool. Battery
can fall out during operation.
OPERATING TIPS
You will extend the life of your bits and do
neater work if you always put the bit in contact
with the work before pulling the trigger. Dur-
ing the oper a tion, hold the tool firmly and exert
light, steady pressure. Too much pressure at
low speed will stall the tool. Too little pressure
will keep the bit from cutting and cause excess
friction by sliding over the surface. This can be
damaging to both tool and bit.
2610034966.indd 11
Capacity
> 2/3
> 1/3
< 1/3
reserve
If battery release tabs
are cracked or otherwise
Fig. 6
batterY
release
tabs
DRIVING WITH VARIABLE SPEED
The technique is to start slowly, increasing the
speed as the screw runs down. Set the screw
snug ly by slowing to a stop. Prior to driving
screws, pilot and clearance holes should be
drilled.
Always hold the machine straight on the bolt
to be tightened.
The best method to determine the right im-
pacting/tightening duration is by means of a
trial. For small screws, the right impacting/
tightening duration can be reached in less
then 0.5 Sec. Therefore, work with low RPM
and switch the machine off immediately when
the screw is tight and the impacting sound can
be heard.
For screwing larger, longer wood screws into
hard material, pre-drilling is the best method.

TIGHTENING TORqUE

The tightening torque depends on the dura-
tion of the impacting/tightening action. The
largest tightening torque is achieved after ap-
proximately 6 to 10 Sec. impacting/tightening
action.
The torque build-up depends on the fol-
lowing factors:
• Hardness of the bolts/nuts.
• Type of washer (disk washer, spring wash-
er, seal).
• Hardness of the material to be joined.
• Lubricating effect at the surfaces of the
junction.
This leads to the following application cases:
Hard case: The joining of metal to metal
with a disk washer. The maximum torque is
reached after a relative short impacting/
tightening action.
Medium case: The joining of metal to metal
where spring ring washer, disk spring washer,
stud bolts or bolts/nuts with conical seats are
used.
Soft case: The joining of e.g. metal to wood or
insulation material.
For middle or soft joining cases, the maximum
tightening torque is less than for hard cases.
Therefore, a longer impacting/tightening ac-
tion is necessary to arrive at the maximum
tightening torque.
FASTENING WITH SCREWS
This procedure shown in (Fig. 7) will enable
you to fasten ma terials together with your tool
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